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The 131 number is the mass number: the sum of the number of protons and neutrons. Iodine has 53 protons and will have 53 electrons if its a neutral atom. To find the number of neutrons, just subtract the mass number with the number of protons 131 - 53 = 78 neutrons. See link below for periodic table.

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14y ago
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14y ago

With 131 particles in the nucleus, Iodine will have 78 neutrons. The atomic number of Iodine (53) never changes, and the atomic number of an element is the number of protons it has. Therefore, 131 particles (protons or neutrons) minus 53 protons = 78 neutrons.

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14y ago

Iodine has an atomic number of 53. The number of neutrons is always equal to the mass number minus the atomic number; in this instance 131 - 53 = 78 neutrons.

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13y ago

131. The number of nucleons (protons and neutrons) in the nucleus of any atom is the same as the mass number of the isotope that is suffixed to the element name.

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7y ago

Iodine-129 has 76 neutrons in the atomic nucleus.

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16y ago

78 - wikipedia is your friend ;)

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14y ago

there are 53 :)

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Q: How many nucleons are in the atom of iodine-131?
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the nucleons contain neutrons and protons in it


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